3 research outputs found

    Multirotor platform with sensory head for measurement of selected air parameters

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    In this article, a project of an unmanned aerial system designed for monitoring of air pollution is presented. The system consists of an autonomous unmanned aerial vehicle (UAV) equipped with a measurement head with sensors of chemical and physical properties of atmospheric air, and a ground control station arranged to store and display the collected data. The head contains modern sensors selective to the most important components of air in view of environmental pollution. Measurement data are acquired locally as well as transmitted wirelessly to a ground station. The UAV can be programmed to a particular measurement missions. The ground station dispose of a software for flight control and for visualisation of measurement results on-line. In this paper, an architecture of the entire system, a data processing performing by each subsystem, and communication methods between them are presented. This paper also includes a specification of sensors with their principles of operation, description of their metrological properties and the way, in which they are implemented in the designed electrical circuits. Results of preliminary tests in a laboratory and in a field, during a short flight, are also presented

    Effect of organic additives on physicochemical properties of polymer thermal grease in electronics application

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    Dynamiczny rozw贸j technologii opartych na uk艂adach cyfrowych wprowadzi艂 elektroniczne uk艂ady do niemal ka偶dej dyscypliny ludzkiego 偶ycia. Rosn膮ce zapotrzebowanie na miniaturyzacj臋, nowe funkcje oraz wzrost wydajno艣ci urz膮dze艅 doprowadzi艂 do wzrostu ilo艣ci wydzielanego ciep艂a. Zaawansowane systemy zarz膮dzania energi膮 uk艂ad贸w elektronicznych oraz wykorzystanie mo偶liwie najlepszych materia艂贸w odprowadzaj膮cych ciep艂o mo偶e nie przynie艣膰 wymiernych efekt贸w, tak d艂ugo jak powierzchnia styku pomi臋dzy tymi dwoma elementami nie b臋dzie idealna. Uzyskanie takiego efektu wi膮偶e si臋 bardzo cz臋sto z ograniczeniami technologicznymi, jak i ch臋ci膮 zachowania modyfikowalnego charakteru urz膮dzenia, dlatego te偶 najlepszym sposobem na wyeliminowanie pustych przestrzeni mi臋dzy radiatorem, a uk艂adem generuj膮cym ciep艂o jest zastosowanie odpowiedniego plastomeru termoprzewodz膮cego. Wykorzystanie tej metody daje mo偶liwo艣膰 indywidualnego doboru ch艂odzenia w zale偶no艣ci od potrzeb, jak i umo偶liwia samodzielny monta偶 podzespo艂贸w bez konieczno艣ci posiadania wyspecjalizowanych narz臋dzi. Termoprzewodz膮ce plastomery nie s膮 jednak rozwi膮zaniem idealnym, poniewa偶 wraz z up艂ywem czasu trac膮 swoj膮 zdolno艣膰 do transferu cieplnego, co wymusza okresow膮 wymian臋 spoiwa. Niniejsza praca ma na celu okre艣lenie wp艂ywu dodatk贸w na parametry fizykochemiczne plastomer贸w termoprzewodz膮cych wykorzystywanych aktualnie w przemy艣le elektronicznym.Dynamical development of digital circuits based technology introduced electronics to almost every discipline of human life. Growing demand for miniaturization, new functions and increasing performance lead to increased amount of heat generated. Advanced power management systems for electronic circuits and possible best heat dissipation materials may not produce measurable results as long as the contact surface between the two elements is not ideal. Obtaining two perfectly flat surfaces is often associated with technological constraints and the desire to maintain the modular nature of the device, therefore the best way to eliminate the void between the heat sink and the heat generating system is to use a suitable thermoplastic plastomer. The usage of thermal compound gives possibility of individual cooling selection depended (based) on the needs and also allow user to assembly components without need for specialized tools. Thermoconductive plastomers are not ideal, as they lose their heat transfer capacity over time, which forces the binder to be replaced periodically. This work aims at determining the influence of additives on the physicochemical parameters of thermoplastic plastomers currently used in the electronics industry
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